Results 281 to 290 of about 146,204 (329)

Attenuated total reflectance as a quantum interference phenomenon

Optics Letters, 1994
The fundamental mechanism of attenuated total-reflectance spectroscopy is elucidated. The characteristic minimum in the reflected intensity is interpreted as being a result of the interference between two events indistinguishable to the detector: the incoming photon either is totally reflected or is virtually converted into a surface-mode quantum.
Herminghaus, S., Klopfleisch, M., Schmidt, H.   +2 more
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Effective Path Length in Attenuated Total Reflection Spectroscopy

Analytical Chemistry, 2008
Attenuated total reflection (ATR) spectroscopy is now the most popular sampling technique for the measurement of infrared spectra of condensed phase samples. Most practitioners of ATR spectroscopy use the equation for depth of penetration, d(p), to estimate the path length of the evanescent wave through the sample. However, the effective path length, d(
Lacey A, Averett, Peter R, Griffiths, Koichi, Nishikida   +2 more
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Attenuated total reflection (ATR) MEMS FTIR spectrometer

MOEMS and Miniaturized Systems XIX, 2020
In this work, we present a MEMS-based ATR FTIR spectrometer operating in the wavelength range of 1.8 μm to 6.8 μm. The core engine of the spectrometer is a monolithically integrated scanning Michelson interferometer on a silicon chip. The ATR crystal is illuminated with an IR source and the output light of the crystal is free-space coupled to the MEMS ...
Amr O. Ghoname, Yasser M. Sabry, Momen Anwar, Diaa A. M. Khalil   +3 more
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Optimum conditions in the attenuated total reflection technique

Applied Optics, 1981
In this paper the optimum condition for using the attenuated total reflection (ATR) technique is studied. In optimum conditions, the energy of an incident plane wave can be totally absorbed. The optimum condition can be realized by fabricating a localized thickness variation in the gap between a prism and a sample substrate with a point contact ...
H, Kitajima, K, Hieda, Y, Suematsu
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Attenuated Total Internal Reflection (ATR) Raman Microspectroscopy

Microscopy and Microanalysis, 2004
Extended abstract of a paper presented at Microscopy and Microanalysis 2004 in Savannah, Georgia, USA, August 1–5, 2004.
L. G. Tisinger, A. J. Sommer
openaire   +1 more source

Attenuated total reflectance infrared microspectroscopy of coal

Fuel, 2000
The measurement of i.r. microspectra utilising an attenuated total reflection (ATR) objective is described. The ATR objective contains a small crystal about 100 μm in diameter which must contact the coal surface. This allows i.r. spectra to be measured from standard polished petrography blocks, without further preparation.
J. Thomasson, C. Coin, H. Kahraman, P.M. Fredericks   +3 more
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Reflectance Spectra Obtained by Attenuated Total Reflection

1969
As was indicated in Chapt. II, c, it is possible in principle to determine the optical constants n and ϰ of materials as a function of λ from regular reflection measurements, i.e. absorption spectra can be obtained. Two measurements are always necessary, e.g., R ⊥ at two different angles of incidence or R reg(α=0) and the phase shift δ, and tedious ...
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High-Sensitivity Attenuated Total-Reflection Spectroscopy

Applied Spectroscopy, 1966
Spectrophotometric analysis by attenuated total reflection was originally developed by Fahrenfort to utilize its low equivalent penetration of the light beam and, therefore, low sensitivity for the study of highly absorbent samples. Nearly simultaneously, Harrick proposed the method for the study of surfaces because of the low real penetration of the ...
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Infrared Spectroscopy by Attenuated Total Reflection

Applied Spectroscopy, 1964
A review is given of the attenuated total reflection method in infrared spectroscopy Some spectra of biological material are included to illustrate its value in the biomedical field
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Combining Infrared Refraction and Attenuated Total Reflection Spectroscopy

Applied Spectroscopy
We have specified and obtained a ZnSe prism with an unconventional face angle cut to 30°. This prism, with internal incidence angles ranging from 30° to 48°, allows users to record internal reflection spectra below the critical angle and attenuated total reflection (ATR) spectra above the critical angle without the need to change optics or
Thomas G. Mayerhöfer, William D.P. Costa, Jürgen Popp   +2 more
openaire   +2 more sources